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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac508fbc855a6e8b565668f68c9812967be2c29ebe94e5acae0903d2d5b0c082' 
  AND token = '9OVdcmZWKphnZF/5VR/qcW1TgRvVT/STTkUq4UHHeR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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