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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d38963b1a7c1f68ccb7f4b965512053d12ecf5fcdfd27e2c55956b5f6c1336e' 
  AND token = 'SlE5NDu/2f9RD8mmPH7RU/rT212dMTUnRLV3/34XCXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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