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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384c4638d91b87e229f9357db0f587fc6dfdb71d3ee4a05850cd5877dd30cf1b' 
  AND token = '6GbU9rntdAJB38/3dyHLLpGDnIoCR7h5vNphhY6Xx3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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