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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557d69514151cfda74c43c1e39fdb1846a44d7aa79c192a91c16d0788d52306c' 
  AND token = 'MGfHhKKdiBQFas8Ts9RwJhdBalg3xozEf61qiQ5fzjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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