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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f9cd3a6536da3b08bb1cbb9cd900fb3f985d97eaaf941e6f0aa67aa26c12fd' 
  AND token = '1WmC/XgvwHaTLNakhJ8+4WnggNOLNDpVpL8dxuj99u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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