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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a603cdd6c03306a15ee34216bf26a8ac81da209c576460608b6e4c7eb2a64b' 
  AND token = 'KHPlMo0z8ih16W7zy8+dlBMUF4TwtON9+7zxHzMN0LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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