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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851343941bd1a3dbddef9214a835c4fcddbd255355d42b751c21a78f75ebbf0b' 
  AND token = 'FnR/fA0QGPsZV/CJH9F0Nw49IKkjUE5Y17Kuq/N+4w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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