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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5baf72d5604d0f736fac1ccf6f7b240040fae9e03c2280c0a960414c016e04' 
  AND token = 'niSxUICtJK0nPyWbWY9bu9Ar0VO9lA8ISp9h38LvT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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