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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cd26a1530532d96e058fafffc5a69f2094a63e3c87fff5bf44bc76a9d733a7' 
  AND token = 'VJL1zKuZZsE52NwtvP0FREbzMiK1593A0yp/2CJJ5zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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