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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c4c30712cc88e205d3613b963d58e7f37af31db425691248de91d06db87648' 
  AND token = 'qbUKq8/Y38ipWSzQi0PAUYJ0VZOkWxRzOGD7yzy0R4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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