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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822af4382a64ab04a9836379ae293cdd6ac5bb528c7045fc75d11c9320aa88ee' 
  AND token = 'LvfV1NB/PvwdawwcoiTs5H0H0r7zFaR5DSSOHGQ2nu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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