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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbba7ba63831350f727419b1d3c7d155f6e315ccb2eb7c4ce8d8be9d8a485b8b' 
  AND token = '9wWa55CtL8zv9dwAIRCCmBwnEz8QQovj++XanK353KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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