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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2790bce7ea439049aaf1e5dfe9dc68f259acdb20b3e8a968a72ebe9119a4964d' 
  AND token = 'uhdUeHRby2A0Qcedcc7dySywIBJDCTgldS7N0wm4cSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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