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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf65bcce7c51daad47c71ae95682ec3d36e2fdc16c7ef91375f4b28f26e3674' 
  AND token = 'uBcf7z9vK1aD0WC6sIOC/MkfO6LoMI8qYQPlj2wwrvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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