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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b467e7ee5d8756010e1b81f31033779914c85cc68b72a9b6c93041083e2bcd' 
  AND token = 'RvBXQkdr6piR9AThlqJs976K2UJnRQAI+99IOWojEe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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