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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b488d11d1208b1ad58a633f5687c04d317dbcf3a9e6ec3dc73cd0d1f418793d' 
  AND token = 'fOi/JKO84AKkXsozNZa0TZriX/OSkmNGRcjULS9iBaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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