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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eeba3a057d7de25a0401b606d376dfef770f846303f086a3da9365d6b1c8713' 
  AND token = '66sLa+rbJx1kXefw7ADOkzwzru+giUcZsi/x3BzYwdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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