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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7a52b9492dba4044558d9abd072d64b3c61f97d2096e3e25cf5703633a5827' 
  AND token = 'srzM1T+76lCrmGBODeifP//LmzSKGJ3L3DfMdznD0DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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