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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dd256ce1f5e1b63bcad27fff052bb7d876bf1e73feedd0d0261618f8b39ae6' 
  AND token = '6x+gYKfopD0mhFzhL/x4OUMburqAtTKqZoRi9TN487g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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