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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62409698486889515f39841a4052cec565e4587d6ca036669550f74549317a0a' 
  AND token = '9vnrgzuyOZMWyKbuazWmsIMFoqTmXY6zxltyA7jJKEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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