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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7914bfdfc31cfce81b516c7faed79349b0e87a6128877650b331e7509ea951' 
  AND token = 'a/fFoDnrEx7h2vgdxvhB/V5tBETxr3P9QrQ3IfItdoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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