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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5331096cd671176f07a38fe42a511f7db492f981bfd6d8bfcfc8652cb9c0f4ff' 
  AND token = 'aNKpkj7Zhmib92p8JBxBiz3raxxmybvt5ZIiNX86MBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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