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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573cdf277b1983535ac2390ac7a1b3ac83f530d7c8c0c028d291429495718ec6' 
  AND token = 'i/j7Ja+n0o4r1nwEHT+ccqBD4IqEM1puSgxEzOvxYY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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