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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda74111d1c16d526d6e0880c2d27ba1d63d18a9a074fa98e1411e9925388021' 
  AND token = 'qPk5yQr3P6h5v1jzeGgfxdRy3jVzYVSJxDGs7g0bQiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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