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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d5e15471319db8f750af668ef5dad8051c1565eeda0ac71f44a33c4b355d5d' 
  AND token = 'sVM6cV0MWHJiFhbJLkrLL9VHlT5Vt2xDo367JnhqAu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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