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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece494b3164bf9d8aa1e6df288d6b0f1fb77fd54e06d10db8af3608f28a4ec6a' 
  AND token = 'nuGs5xiojZ4e3/gmI5xpT5lZMADXMundd2LQnafn3dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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