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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0603cea50e2d621f7ee0e7565254c9dcb24248b260abd92b3b7b02497f4afe' 
  AND token = '81afHqZK4kAv/uuEYdK2UiA++OSBPK6bCiQAh5I5Jbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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