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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247c77e11564b68cb1841f29c2b6dfccee0b18df2f4102feb448ab580495cd6c' 
  AND token = 'XWVkFXNXEUo7uP2eUP2kWy//gqkerrivwN5IqyxHzoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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