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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1ffcb2f03df65c155409a57f60b0f314f3a223043fe8702c2247577fd875d9' 
  AND token = 'RAQtactHN6CSu04Hb2Civ6yHKQpqtC9gS2Y7+9rgOAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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