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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbdcb979b21b5f8a9eebad7eee26b744427bcff8a0ff42c9842383a746a907d' 
  AND token = 'REE7dR1VpWZP4+bRQ+HKX0l7WJ1O+G3WuteDnyx64Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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