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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23d8ebd0f7d82d0d582aa63d2faa17f3666fade0d6e6bbe21328db28de3f83e' 
  AND token = '6GbjiFioCbDMHfpMWDV+bIhSA01jIhdzchiXYCDJ2s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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