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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fc287fd6df1db097f19f937bfb00b78cc60941d650f93daedbb72ec50b4b65' 
  AND token = 'Qd6Xi2eyBntULy/XoGOvJw9aqAB64fcoaLNsX0i8t1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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