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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dc7a5559798a80d3721f7695d1fb082adf0928e81e1ca6df247b411d4e89c6' 
  AND token = 'nUzuM6mMID+9h8dwI9ZNZW0IuA5Vi4RU9I6hWoRIeVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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