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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd47f20721fbebd691f6e8443b972324ad2a2685fd626f4e9e72e83313ff99bf' 
  AND token = 'iW/VfpKP8SdHGN6J0ydBTWuG8U5gcbcyoukaQ6RPi3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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