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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b4d6187f9e7251edef1222f8f934fc455298426663b2446cd594b1934c8c9e' 
  AND token = 'Yln3VrCS8Y7FyRqqbX6iyQmR0Kwf0HP4GO0e1C2EcZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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