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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b277f3ae82b1ddcf6d9c3a8d6e963838a3e5aa8677ee151328d50513445fe2' 
  AND token = '945vSBwImspufkwvXUlNE06Ot2n0B5Wrc32D9WmG0JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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