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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca2b75b1de352fa1ff4339784a01b84ce6f4f4fe55917269e1089ac6c6a6a19' 
  AND token = 'LEg6Rs5cT8wv3iuJbeIPiybeWX8ehJRpX+THg4bZZU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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