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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec26b0d299dbe650cad52d48081d2b85981c706ff3b8d2162f96456764b91b21' 
  AND token = 'GLWoX1gxDwza9QtHa5wCfcrNCtToc4oW0mL0H7Jo+Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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