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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94793133e7c10edc3b67f5c86eea0479996dff6d40db4086e361936c8db448c3' 
  AND token = 'uWgy6uDKgMfrpiTRpF3DrooPkVhrtfJ8qB4YN/3w1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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