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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d4774c3f8def9dd814e5ce0d2b380e2ad2ea48a28ae79726a4f113a203e33a' 
  AND token = 'R9Nl9szrm+qv1SVhzr4rbYWHh9l9gL5zooIjtvwdp7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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