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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9da68f8a88cf239e5f40171395907f8d3cec9cf3adf1ad8e3abd777a71c0a2' 
  AND token = 'V5co4/DaSiJ4eApA/EDfPuMj9+r+qVI1IdngH4K2vSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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