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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d1e43df25aa08746cd37f9fad4cb0ea6ad8d0196dd403a8c9bab936cede8b4' 
  AND token = 'd6pTTOdniwH02eeQo4U3LF/8mVE78FmW5+XGEpGocng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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