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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b5ef4696ccc18b4b549e23d0dc89b1072cfc404356f07a26ff30bad69c3d9a' 
  AND token = 'PEhUVU+0TIbR1oeX+CTCOfHHQvD2awbGTi2xYRD6Ak0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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