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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249c4426e4f8f26d9c558ca7b1b17d7a12a22cde4c3322b548db26ec72f9d7c8' 
  AND token = '2PX+TJ7ItYE2htf2jIOO6QM3h3EUj274AYB7F+bWc5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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