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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b87bfc6235b83a1a4e71c9ee122813bd0d14a3ae507c88b783094e7499655a' 
  AND token = 'O1W7rxEe+98VLMK/zll7ntkk9EXKsMuz4+OavwG0gUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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