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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8347c32ae056319ca7ceeccff3071d6dbde99bd95a9888f1377beef5ae2983cd' 
  AND token = 'S6wHfTeMxUigvLsf/iqB2C62mFiT3k/NOJfOqgN+mYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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