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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fa58a36afde87161867b698d5138b38068b441e6c4e20e37cc848e57dd708c' 
  AND token = 'DK9XA7Vi575huTmqpNSF5HQPlzY8fkUhZIJ1H+QRu68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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