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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7881b5f55626926abdbf84f1d8c7fd0e7aae8cdeff8261d0c557b0a8fbe471e' 
  AND token = 'gehBEhWAo2vKBYpdfCVYS9PsZ2rcA4l+0LiUnMWPi1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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