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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c690a4b165aaaebb82d62f3c6a1038a2769fb3ba348e7168b17413fc68214fba' 
  AND token = 'GiH4jQDZCkXai1gWidPNJK58OSbslPs4tUdxkw1OQRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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