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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37750bfb9af46ab27cb1d6cf4d2e508b22b3d1b249968d23df364c053c699fa9' 
  AND token = 'zYYOGjU2kv9UMEwOXqODF2OU38M1b/l50zy0eWyKqlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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