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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b42b06172fa22d6bc35030fbd3c31018b5ffff7dd31ff4caf8bcad34e21a1d' 
  AND token = 'faf/0VTnX1tZq4pLMfoTsQLUTxCdF0N7bUSiNEgmFLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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