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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f249855a4f245e8bcaecd7f49bf413343b28a3022b28859084948b6ea445c260' 
  AND token = 'tNVJ4pgxRld5ho58eVAdZy/xPty1xyL4VLI28Wn5IKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}