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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e23528dfc875f1abf70f576338168a4ab72b2f5048f26204e6a8d989290e2b' 
  AND token = 'Xi9Tl2r6m55Dk769bTFPRad3bP7sYRsp5tIetH7Selw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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