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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7295427cb5c68bad1808564012944b58298835c77711414736b65aacb584e1' 
  AND token = 'qrv/4gt1TI/yjHy0Na5cD3hO65FeDDuKviEu7C+UcNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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