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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88c71dd6cfa3d454281c3fa1ea30444a9f80ab82ddb1b08593a4756f8c68acf' 
  AND token = 'etsSY5X3/G8vBUsx4px6FhB9GHOg5PC5wb+3T24Qfto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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