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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e17b80bde101f8cc71dad44c0d6bd38561080a919a41f3f193a4e28a5dfad1b' 
  AND token = 'Cs7bTgKpRQOKFcIeqktpjJSQXBRDi+oIKksUXPLae7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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