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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28169d9b555877d859d9902e9acfae587d6cf3131003908ccd45fa479106e653' 
  AND token = 'IyjLJ/Q8IbwzJr03IbmgW8SX9z+TW7kO7QaG3umX0v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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