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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9710489f116c4d301df86b6ccfafbea2f4726f5baf3663c69b9b63ddba5eb6a' 
  AND token = 'hxFjj/rsebNoeh2QHRC8fk1J+WznJ8xqtID3wM9hpbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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