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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c924956dacc74228a478671f87f4de64b73358ec181ae8d61f87a538f64be462' 
  AND token = 'ebpLUypqAbR9QCzBoG6iBqOLuSzTM1MBiayZ9GBBjN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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