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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4f1fc3860bedbcb4190ccc39098595a74713ff4e565d5f360dec583b5a9436' 
  AND token = 'VB8Tc5/FCSqYJ1Qi7Bq70fmcvkWeQBWDG8jXj6e3ZMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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